16 barrel !! Questions

[jmiddy]

Greetings, i just a recieved a upper i bought on the parts thread, and i have a couple questions from some of u guys, please help.

First question no markings on the barrel except for a serial number on the barrel located uner the handguard.
Next it has m4 ramps and the reciever does not have them!!

any help greatly appreciated.

\Thanks

 

[Armedsask]

You posted no questions.

Or is it like Jeopardy, where we say the questions after you gave the answers?

 

[jmiddy]

16 Upper

Question 1

The barrel has no markings except for a serial number located underneath the handguards. Who makes these.

Question 2

What twist rate?

Question 3

Is it 5.56 or 223?

Im thinking its a military barrel or am i wrong!

 

[scotty]

Pictures and the serial number would help.

 

[TDC]

Your twist rate you can be determined with a cleaning rod and a bore brush(or jag). Insert rod with brush attached, pull slowly until the rod completes one revolution. Measure the distance on the cleaning rod from start---one complete revolution. It won't be something obscure like 1:6.7 or 1:8.38. It's probably 1:9 or 1:7 so round up/down accordingly.

5.56 can be shot through a .223 chambered rifle. The potential for KB's is nil. The increased chamber pressure of 5.56 over .223 is around 12,000 PSI. Your barrel was(should have been) proof tested with 300% over pressure rounds. The chances of finding authentic 5.56 are quite slim anyway. You could always purchase some go-no go gauges.

TDC